Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8de0e0406ac0a785b4b542760e0e1c6f324d026ecf492b5f54129b9961cbb4d3:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16